摘要
本试验所用原料为大同怀仁和徐州夹河煤系高岭土，这两种原料的ＳｉＯ２和Ａｌ２Ｏ３分子比均接近于２，其成分能满足合成４Ａ沸石的要求。本试验首先进行了原料的焙烧活化及漂白的试验研究，解决了原料的白度问题。分析探讨了合成４Ａ沸石过程中成分、碱度、温度、时间及搅拌等对合成试验的影响，并通过对比试验获得了最佳合成条件，得到了合格的４Ａ沸石产品。
zeolite is being increasingly used in
detergent in place of sodium trip olyphosphate (STPP). In this paper, 4 zeolite was synthesized
directly fr om kaolin without adding aluminium compound. The results show that the exchange
capacity of calcium is 280～310mg· CaCO 3/g(dry) , the average diameter of a particle is 4.
10 μ m, the relative whiteness is 85～91%, and pH≤11. The raw materials were collected
from Jiahe of Xuzhou in Jiangsu Province and Da tong kaolin mine in Shanxi Province. The
optimum SiO 2/Al 2O 3 molar ratios o f these two sorts of kaolins are about 2, being highly
pure (kaolinite >95%) and easy to pretreat by means of calcination. The activity of kaolin in the
process of calcination, the formation and aging of gel and the crystallization of 4 zeolite were
studied through experiment ation. The optimal processing conditions were selected for different
kaolins in accordance with their different structures and compositions. The recycle of moth e r
liquors was resolved in order to reduce costs of the process. The author inves tigated the effect
of reaction time, alkalinity, solid contents in synthesized m ixtures and mechanical forces on
the synthesis of 4 zeolite.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
1999年第2期178-185,共8页
Acta Petrologica et Mineralogica
